package com.czk.model.facade;

public class TheaterLight {
    private TheaterLight(){}
    public static final TheaterLight theaterLight=new TheaterLight();
    public static TheaterLight getInstance(){
        return theaterLight;
    }
    public void on(){
        System.out.println("灯光开");
    }
    public void off(){
        System.out.println("灯光关");
    }
}
